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As a new type of denim fabric, mercerized knitted denim has become more and more popular with customers since its appearance in the market in 2004. According to statistics, more than 80% of denim fabric manufacturers have produced or touched denim fabrics. However, due to professional constraints, equipment constraints, market competition and other reasons, the mercerized processing technology of knitted denim of various enterprises has great differences, Moreover, there are great differences in comments on mercerizing effect, so there are great differences in mercerized denim fabrics produced by various enterprises.

Different from the traditional fabric mercerizing, the main purpose of mercerizing knitted denim is to achieve excellent dimensional stability, gloss and texture clarity after washing, which is also known as flatness finishing abroad. Because the mercerizing of knitted denim is not intended for dyeing, the traditional "barium value" method is not used to evaluate the mercerizing effect of knitted denim. Now we only evaluate the mercerizing effect through visual inspection and hand touch. We think that the knitted denim with good mercerizing effect will be smoother, clearer texture and better luster after washing. The mercerized knitted denim will have tight hand feel, smooth and bony.

Mercerizing is undoubtedly the most critical process in the mercerizing process of knitted denim, which directly affects the mercerizing effect of knitted denim after all. Because knitted denim is mostly heavy fabric, and the grade of cotton used is low, the formation of mercerizing alkaline solution has poor permeability to knitted denim. Therefore, compared with light and thin fabrics such as white fabric and conventional colored fabric, the caustic soda solution in the mercerizing process has poor permeability to the fabric, This is also the primary reason why the mercerizing effect of knitted denim is worse than that of other fabrics. Therefore, improving the penetration of alkali in the fabric during the mercerizing process can become the most crucial link to improve the mercerizing effect of knitted denim. In addition to strengthening the desizing mentioned above, another important way to improve the penetration effect of alkali on the fabric is to adjust the alkali penetration ability through adjusting the concentration of caustic soda, increasing the cleaning agent and rolling pressure.

The whole mercerizing process of knitted denim is carried out in an open width. After mercerizing, there is a large potential shrinkage rate in the warp direction. The tension in the whole process of cleaning is large, and because there is no diagonal device, the internal stress of the fabric's internal weft angle cannot be removed. The weft angle changes greatly before and after washing, so it is necessary to carry out diagonal and pre-shrinking cleaning. The cleaning process is the same as that of knitted denim.

The main purpose of mercerizing knitted denim is to achieve excellent smoothness, texture clarity and luster after washing. The desizing treatment before mercerizing is beneficial to the soaking of cotton fiber by caustic soda and improves the mercerizing effect of knitted denim. The mercerizing treatment of knitted denim requires mercerizing agent to enhance the penetration of caustic soda on cotton fiber and improve the mercerizing effect of knitted denim.

The article originates from the knitting denim factory:http://m.cqttw.cn/